Improvement in machine for grinding- the knives of mowing-machines



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B E NJAMIN- F. DAVI S, 4OF AUBURN, NEW YORK..

I Leners Patent No. 87,150,1dead Fama/w23, 1869.

:Nr.preovrznmrn'` 1N MACHINE ron GRINDING TBE KNIVES or MowING-MAcHl-INES.

The Schedule referred to in' these Letters Patent ad making part of the same.

Y* To all whom it ma/y concern.-

Be it known that I, BENJAMIN F. DAvIs, of Auburn, in the county of Cayuga, and State of New York,

have invented certain new and useful Improvements in Machines for Grinding the Knives of `MowingMachines; and I do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, making a part of this specification, in which- Figure 1 represents a perspective view'of the entire mach-ine, with a sickle-bar in place, ready to be ground. Figure 2 represents a broken side elevation, to show the inode oiapplyingthe sickles, or sections to the stone.

Similar letters ci' reference, where they occur Ain the separate gures, denote like parts of the machine inboth of the drawings,

Many forms of these sickle-section grinding-machines have been made and patented, but much remains to be done to'make them cheap, portable, and efficient, andA t'o accomplish, ina perfect manner, the object and purpose for which they are designed.

My invention has for its object the more ready bringing up of the edges to be ground, tothe face of the stone, and the atterward moving of the edge to bey ground, on theface of the stone, but in a true plane, by which means. the grinding is more rapid, and the face of the stone prevented from glazing.

To' enable others skilled in the art to make and use my invention, I will proceed to describe the same with reference to the drawings.

A. represents a grindstone, hung on. a frame, B, of

the usual well-known kind. Upon either' or both of the ends of the frame there is a bench, C, furnished with a series of holes, a a, in or to which the base D, of the clamping and swinging frame is attachedby the set-screw b and thumb-nut c, aiter said frame has been so adjusted as to bring the sickle-sections to thegrindstone at the angle necessary to grind the desired bevel to the edges thereof.

To the base D are hinged, by hinges d d, the arms E E, which incline toward Athe stone, but can be swung back from the stone, orto it, until its ends are-fairly seated on the base D. rlhese arms are united by a tie, F, so as to constitute a swing-frame.

N otches, or gains, e e, are formed in the tops of the arms E E, into which a round bar, f, having its ends, g, turned at right angles to the line of its length, lies, and can -roll or turn, said bar being held from leaving the notches by pins h h passing over them.

arms E, then the sickle must be shifted in the clamping-bar, and -the bar can again vbe shifted alongvv to bring thesections, in succession, to the stone.

It would be possible, of course, to make the rod and the clamping-bar long enough to grind a whole sickle without shifting itin the bar, but there would be no economy in so doing, as everything would have to be heavier and stronger, or else shackling.

By this mode of arranging the parts, I attain-four.

very desirable movements, which have never before been combined in one machine, viz, first, the oblique adjustment of the sickle to the stone; second, the swinging of the sickle toand from the stone; third, the vmoving of the` sections up and down on the face of the stone; and fourth, the moving of the section and clamping-bar laterally on or in the swing-frame, to .bring the' sections successively to the stone. t

'Three of these movements may haver been attained on one and the same machine, but not the four; and it is the construction and arrangement by which these four movements are attained, that constitute my' in-` .vention.

The object of the third motion, hereinabove `mentioned, is to expedite the grinding, by moving the section up and down against the stone, which, besides, prevents the`face of the stone from glazing.

Havingthus fully described my `invention,

What I claim therein as new, and desire to secure In combination with the swinging frame E, the bent rod g, for holding and affording two motions: to thev clamp and ciitterbeing ground, viz, an up and| down, and a longitudinal motion past the stone, substantially as described. B, F. DAVIS. Witnesses:

A, B.y SToUeHToN, EDMUND MAssoN. 

